Abnormal Rheological Behavior of Linear Low Density Polyethylene Melts at High Shear Rate

Kim, Jaewhan; Kim, Dong Hak; Son, Younggon

doi:10.1007/s00289-008-0907-9

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The above puzzle conflicts with many previous studies on rheology and time-temperature superposition (TTS), whereas similar types of results have been obtained by van Gurp and Palmen [5] and many other authors [6][7][8][9][10][11][12]. However, since our results obtained using precise models were more reliable than those developed previously, we were able to investigate this anomaly and verify TTS only for thermorheologically simple materials.…”

Section: Introductioncontrasting

confidence: 71%

Linear viscoelastic models

Borg¹,

Pääkkönen

2010

Journal of Non-Newtonian Fluid Mechanics

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Section: Introductioncontrasting

confidence: 71%

Linear viscoelastic models

Borg¹,

Pääkkönen

2010

Journal of Non-Newtonian Fluid Mechanics

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“…Recently, we have been conducting capillary extrusion experiments with various metallocene catalyzed polyethylenes 13, 21, 24, 25. We observed very interesting rheological behaviors for these materials.…”

Section: Resultsmentioning

confidence: 95%

Effects of long chain branching on melt fractures in capillary extrusion of metallocene‐catalyzed linear low‐density polyethylene melts

yoo

Kim

Son

2012

J of Applied Polymer Sci

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To investigate the effect of long chain branching (LCB) on melt fractures of metallocene-catalyzed linear low-density polyethylene (mLLDPE), we prepared a series of sparsely long-chain-branched mLLDPEs with well-defined degrees of LCB. Gross melt fractures were observed to decrease as the degree of LCB increases. This is in accordance with a prediction based on the observation that LCB enhances chain entanglement and consequently increases the melt strength of a polymer. However, sharkskin melt fracture (SMF) was observed to be more severe with the degree of LCB. There have been debates over the effect of LCB on SMF. According to a well-known mechanism of SMF, SMF is expected to decrease with the degree of LCB. Therefore, the majority of research groups believe that SMF decreases with the degree of LCB. This study clearly shows that the SMF becomes more severe with an increase of the degree of LCB and suggests another possible mechanism for the SMF. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E322-E329, 2012

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Flow-induced morphology evolution of uniformly miniaturized high-density polyethylene parts prepared by micro-injection molding

Yang

2013

Int J Adv Manuf Technol

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Abnormal Rheological Behavior of Linear Low Density Polyethylene Melts at High Shear Rate

Cited by 6 publications

References 22 publications

Linear viscoelastic models

Linear viscoelastic models

Effects of long chain branching on melt fractures in capillary extrusion of metallocene‐catalyzed linear low‐density polyethylene melts

Flow-induced morphology evolution of uniformly miniaturized high-density polyethylene parts prepared by micro-injection molding

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